/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --danger-color: #dc3545;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --info-color: #17a2b8;

    /* Dark Theme */
    --dark-bg: #0f0f0f;
    --dark-bg-secondary: #1a1a1a;
    --dark-card: #2a2a2a;
    --dark-border: #404040;
    --dark-text: #e0e0e0;
    --dark-text-secondary: #a0a0a0;

    /* Light Theme */
    --light-bg: #ffffff;
    --light-bg-secondary: #f5f5f5;
    --light-card: #ffffff;
    --light-border: #e0e0e0;
    --light-text: #000000;
    --light-text-secondary: #666666;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Transitions */
    --transition: all 0.3s ease;
}

/* ===== Dark Theme (Default) ===== */
.dark-theme {
    --bg: var(--dark-bg);
    --bg-secondary: var(--dark-bg-secondary);
    --card: var(--dark-card);
    --border: var(--dark-border);
    --text: var(--dark-text);
    --text-secondary: var(--dark-text-secondary);
}

/* ===== Light Theme ===== */
.light-theme {
    --bg: var(--light-bg);
    --bg-secondary: var(--light-bg-secondary);
    --card: var(--light-card);
    --border: var(--light-border);
    --text: var(--light-text);
    --text-secondary: var(--light-text-secondary);
}

/* ===== Global Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    transition: var(--transition);
    line-height: 1.6;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 28px; }
h2 { font-size: 24px; }
h3 { font-size: 20px; }
h4 { font-size: 18px; }
h5 { font-size: 16px; }
h6 { font-size: 14px; }

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    opacity: 0.8;
}

/* ===== Buttons ===== */
button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    border-radius: var(--radius-md);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-md);
}

.btn-primary:hover {
    background-color: #0056b3;
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: var(--dark-card);
    color: var(--text);
    padding: 10px 20px;
    font-size: 14px;
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background-color: var(--border);
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
    padding: 10px 20px;
    font-size: 14px;
}

.btn-danger:hover {
    background-color: #c82333;
}

.btn-secondary:disabled,
.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== Inputs & Forms ===== */
input, select, textarea {
    font-family: inherit;
    background-color: var(--dark-card);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: var(--transition);
    width: 100%;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

input::placeholder {
    color: var(--text-secondary);
}

input[type="date"],
input[type="time"],
input[type="datetime-local"],
input[type="month"],
input[type="week"],
input[type="number"],
input[type="email"],
input[type="tel"],
input[type="search"],
input[type="url"] {
    color-scheme: dark;
}

/* ===== Landing Page ===== */
.landing-page {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-bg-secondary) 100%);
}

.landing-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-text {
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(135deg, #007bff, #0056b3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-subtext {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 600;
}

.logo-compact {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #007bff, #0056b3);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.logo-compact .logo-text {
    font-size: 20px;
    background: none;
    -webkit-text-fill-color: white;
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--spacing-xl);
    padding: 80px var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
    text-align: left;
}

.hero-content h1 {
    font-size: 48px;
    background: linear-gradient(135deg, #007bff, #00d4ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.hero-content > p:first-of-type {
    font-size: 24px;
    color: var(--text);
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.hero-illustration {
    display: flex;
    justify-content: center;
    align-items: center;
}

.fitness-icon {
    font-size: 120px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* Features Section */
.features {
    padding: 80px var(--spacing-lg);
    background-color: var(--bg-secondary);
    text-align: center;
}

.features h2 {
    font-size: 36px;
    margin-bottom: var(--spacing-xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background-color: var(--card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(0, 123, 255, 0.2);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text);
}

.feature-card p {
    color: var(--text-secondary);
}

/* CTA Section */
.cta-section {
    padding: 80px var(--spacing-lg);
    text-align: center;
    background: linear-gradient(135deg, rgba(0, 123, 255, 0.1), rgba(0, 212, 255, 0.1));
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.cta-section h2 {
    font-size: 36px;
    margin-bottom: var(--spacing-lg);
}

.cta-section p {
    font-size: 18px;
    margin-bottom: var(--spacing-lg);
}

/* Footer */
.landing-footer {
    text-align: center;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

/* ===== App Layout ===== */
.app-layout {
    display: grid;
    grid-template-columns: 250px 1fr;
    min-height: 100vh;
}

.sidebar {
    background-color: var(--dark-card);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    width: 250px;
    height: 100vh;
    overflow-y: auto;
    z-index: 200;
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.menu-toggle {
    display: none;
    background: none;
    color: var(--text);
    font-size: 20px;
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md) 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-link:hover,
.nav-link.active {
    background-color: rgba(0, 123, 255, 0.1);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.nav-icon {
    font-size: 20px;
}

.nav-label {
    font-weight: 500;
}

.sidebar-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border);
    display: flex;
    gap: var(--spacing-sm);
}

.theme-toggle {
    flex: 1;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 10px;
    font-size: 18px;
    border-radius: var(--radius-md);
}

.logout-btn {
    flex: 1;
    background-color: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
    padding: 10px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-md);
}

.logout-btn:hover {
    background-color: var(--danger-color);
    color: white;
}

.main-content {
    grid-column: 2;
    background-color: var(--bg);
    overflow-y: auto;
    margin-left: 0;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    background-color: var(--bg-secondary);
    position: sticky;
    top: 0;
    z-index: 50;
}

.user-info {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===== Dashboard ===== */
.dashboard-content {
    padding: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.dashboard-content > h2 {
    margin-bottom: var(--spacing-lg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: linear-gradient(135deg, var(--dark-card) 0%, rgba(0, 123, 255, 0.05) 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: var(--transition);
}

.stat-card.clickable {
    cursor: pointer;
}

.stat-card.clickable:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(0, 123, 255, 0.2);
}

.stat-icon {
    font-size: 40px;
    min-width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
}

.stat-icon.total {
    background-color: rgba(0, 123, 255, 0.1);
}

.stat-icon.active {
    background-color: rgba(40, 167, 69, 0.1);
}

.stat-icon.warning {
    background-color: rgba(255, 193, 7, 0.1);
}

.stat-icon.danger {
    background-color: rgba(220, 53, 69, 0.1);
}

.stat-info {
    flex: 1;
}

.stat-info h3 {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--text);
    margin: 0;
}

.stat-arrow {
    font-size: 24px;
    color: var(--primary-color);
    opacity: 0;
    transition: var(--transition);
}

.stat-card.clickable:hover .stat-arrow {
    opacity: 1;
    transform: translateX(5px);
}

/* Quick Actions */
.quick-actions {
    background-color: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.quick-actions h3 {
    margin-bottom: var(--spacing-md);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.action-buttons a {
    flex: 1;
    text-align: center;
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text);
    transition: var(--transition);
}

.action-buttons a:hover {
    background-color: var(--border);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Recent Activity */
.recent-activity {
    background-color: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.recent-activity h3 {
    margin-bottom: var(--spacing-md);
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.activity-item {
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-left: 3px solid var(--primary-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-secondary);
}

.activity-time {
    font-size: 12px;
    color: var(--text-secondary);
}

.placeholder {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-lg);
}

/* ===== Members Page ===== */
.members-controls {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.search-box {
    position: relative;
}

.search-input {
    width: 100%;
    padding: 12px var(--spacing-md);
    border-radius: var(--radius-md);
}

.filter-controls {
    display: flex;
    gap: var(--spacing-md);
}

.filter-select {
    min-width: 200px;
    padding: 12px var(--spacing-md);
    border-radius: var(--radius-md);
}

.members-container {
    padding: var(--spacing-lg);
}

.loading-state {
    text-align: center;
    padding: 60px var(--spacing-lg);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.empty-state {
    text-align: center;
    padding: 60px var(--spacing-lg);
    color: var(--text-secondary);
}

.members-list {
    display: grid;
    gap: var(--spacing-lg);
}

/* Member Card */
.member-card {
    background-color: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--spacing-lg);
    align-items: center;
    transition: var(--transition);
}

.member-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.1);
}

.member-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 20px;
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
    flex-shrink: 0;
}

.member-info {
    display: grid;
    gap: var(--spacing-sm);
}

.member-name {
    font-weight: 600;
    color: var(--text);
}

.member-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    font-size: 13px;
    margin-top: var(--spacing-sm);
}

.member-detail-item {
    display: flex;
    flex-direction: column;
}

.detail-label {
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-value {
    color: var(--text);
    font-weight: 500;
}

.member-phone {
    color: var(--primary-color);
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
}

.member-phone:hover {
    text-decoration: underline;
}

.member-status {
    display: inline-block;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.status-active {
    background-color: rgba(40, 167, 69, 0.2);
    color: #28a745;
}

.status-expired {
    background-color: rgba(220, 53, 69, 0.2);
    color: #dc3545;
}

.status-expiring {
    background-color: rgba(255, 193, 7, 0.2);
    color: #ffc107;
}

.member-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.action-btn {
    padding: 8px 12px;
    font-size: 12px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
}

.action-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.action-btn.delete:hover {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.action-btn.message:hover {
    border-color: #25d366;
    color: #25d366;
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 300;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--card);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    margin: 0;
}

.modal-close {
    background: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text);
}

.member-form {
    padding: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    font-size: 14px;
    color: var(--text);
}

.error-message {
    color: var(--danger-color);
    font-size: 12px;
    margin-top: 4px;
    display: block;
}

.form-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
}

.form-buttons button {
    flex: 1;
}

.confirm-modal {
    max-width: 400px;
    text-align: center;
}

.confirm-modal h2 {
    margin-bottom: var(--spacing-md);
}

.confirm-modal p {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.modal-buttons {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
}

.modal-buttons button {
    flex: 1;
}

/* ===== Toast Notification ===== */
.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text);
    z-index: 400;
    animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--danger-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}